Route reliability record
MIA→CVG
Miami to Cincinnati
- Flights
- 989
- Period
- September 2025 to August 2026
- Distance
- 948 mi
- Carriers
- 5
This route lands a B+, 4 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 989 MIA to CVG flights, with a median arrival 8 minutes early.
Best time to fly MIA to CVG: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 95.4% of the time and Tuesday flights 88.2%, against 81.4% for the route overall.
Set against the rest of the country, this route's record is 4 points better than the US average of 77.3%. That gap is worth roughly 41 fewer late arrivals for every thousand flights.
Key figures
On time
81.4%
Arrivals under 15 minutes late, of 979 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
0.91%
National rate is 1.89%
Best carrier
Envoy
83.5% on time across 805 flights
These figures cover 989 flights between September 2025 and August 2026. The median arrival is 8 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Which airline is most reliable on MIA to CVG
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 1 | 100.0% | — | 0.00% | A+ |
| Envoy Air | 805 | 83.5% | 44 min | 0.62% | B+ |
| American Airlinesthin sample | 76 | 78.7% | 102 min | 1.32% | B |
| Frontier Airlinesthin sample | 102 | 67.7% | 82 min | 2.94% | C |
| Republic Airwaysthin sample | 5 | 60.0% | 60 min | 0.00% | D+ |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Best ways to make this trip
The most reliable ways to fly Miami to Cincinnati
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 1 of the top 2 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. MIA → CVGMiami to Cincinnati | Envoy Air | 83.0% | 83.5% | 0.62% | 8am–11am, Tue | — |
| 2. FLL → CVGFort Lauderdale to Cincinnati | Delta Air Lines | 71.1% | 71.8% | 0.95% | 11am–2pm, Wed | DL 661 17:59 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 19 points, against half a point between the best and worst carrier.
- 5am–8am5 flights—
- 8am–11am130 flights95.4%
- 11am–2pm27 flights—
- 2pm–5pm236 flights76.9%
- 5pm–8pm311 flights81.7%
- 8pm–5am280 flights80.2%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 95.4% of the time, against 76.9% for the afternoon window. That is 19 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 311 flights scheduled in it.
Explore
Filter MIA to CVG by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On MIA to CVG, the best departure window is 8am–11am at 95.4% on time and the worst is 2pm–5pm at 76.9%, a wide gap of 18.5 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am95.4%
- 11am–2pm—
- 2–5pm76.9%
- 5–8pm81.7%
- 8pm–5am80.2%
best all US flightsScale 60% to 100%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 20 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
Delays peak in March, when the on-time rate falls to 73.7%. June is the strongest month at 93.2%. Moving a flexible trip across that boundary buys 20 points. March was the busiest month here, with 123 flights.
Across the week, Tuesday is the strongest day at 88.2% on time and Saturday the weakest at 73.8%, a spread of 14 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 53% of the 10,000 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Late-arriving aircraft
- 23%National Airspace System
- 21%Carrier
- 3%Extreme weather
- 0%Security
53% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 10,000 reported delay minutes here, that single category outweighs weather by 17 to one. The split is drawn from 10,110 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 95.4% on time here.
Cancellations sit at 0.91% against a national 1.89%, which is ordinary. Diversions add another 0.10%.
Connections and stage length
What a delay here actually costs
5.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 948 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg runs 81.6% on time across 989 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 989 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
Work out the risk of missing a connection in CVG after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 989 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 81.4% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 979 completed flights over 12 months sit behind that.
Common questions
MIA to CVG questions
How often is MIA to CVG delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 18.6% of the 989 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is MIA to CVG compared with the rest of the country?
81.4% of flights arrive on time here against a national 77.3%, a difference of 4 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on MIA to CVG?
The 8am–11am departure window is the strongest at 95.4% on time. The 2pm–5pm window is the weakest at 76.9%, 19 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are March delays on MIA to CVG?
March is the weakest month at 73.7% on time, compared with 93.2% in June. Across the year that is 20 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- CVG to MIA — the return legseparate record
- Miami International (MIA) delay statistics
- Cincinnati/Northern Kentucky International (CVG) delay statistics
- Envoy Air on MIA to CVG83.5%
- Frontier Airlines on MIA to CVG67.7%
- MIA to ATL, a related route74.2%
- ORD to CVG, a related route72.1%
- MIA to LGA, a related route67.4%
- Delta Air Lines on-time record100.0%
- Envoy Air on-time record83.5%
- American Airlines on-time record78.7%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. MIA to CVG and CVG to MIA are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.